Electric range



May 14, 1935. R. JOHN 2,001,326

ELECTRIC RANGE Filed June 27, 1932 1 1 a; L f I 1 r gvwcwto Patented May 14, 1935 PATENT OFFICE ELECTRIC RANGE Robert John, New York, N. Y.

Application June 27, 1932, Serial No. 619,570

9 Claims.

This invention relates to electric cooking ranges of the type comprising one or more heating elements capable of providing heat by passing an electric current through electrically resistant'material; it has as its principal object, the provision of means forautomatically removing or neutralizing odors formed in the process of cocking, to the end that such odors may be prevented from pervading the kitchen and other parts of the house or apartment.

vAs is well known, such odors may be prevented from spreading by the conventional practice of providing a hood over the cook stove and an exhaust fan whereby the air in the vicinity of the stove is constantly being removed; or by the production of ozone in the kitchen, which acts as a deodorant by giving up one atom of oxygen to combine with the unsaturated compounds of which smells are constituted, whereupon the ozone residue consists merely of normal atmospheric oxygen. The present invention may be used to employ either of the foregoing deodorizing agencies, or a combination of both of them,

and provides a means for such employment whereby either or both ofthese agencies are placed in effect by the act of closing the manual switch controlling the flow of current to one or more of the heating elements; and such effect is automatically continued subsequent to the opening of the manual switch, such continuance being capable of regulation to cover the period during which hot foods, while no longer cooking, are still exposed in containers in the kitchen and are still capable of giving ofl odors.

My invention comprises an electrically operated ozonizer or an electrically operated exhaust fan, or both in combination, either or both of which are wired in parallel with each separately controlled electrical heating element of the range, whereby the closure of one or more of the manual switches governing said heating elements supplies electro-motive force to said ozonizer or said blower or to both of them, as the case may be;

and a thermostatic switch which, when closed by the heat generated by said electrically heated elements, is capable of continuing the flow of electro-motive force to said ozonizer or said fan or both of them after the manual switch above referred to is opened for such period as may be decided upon as desirable.

Other objects and advantages of the invention will appear in the following description of the preferred embodiment of the invention shown in the attached drawing of which:

Figure 1 is a perspective view of an electric range embodying my invention; and

Figure 2 is a schematic diagram of the electrical connections.

Referring more particularly to the drawing, in indicates in general the electric range, ll indicates in general the ozonizing unit and I2 indicates the exhaust fan. As shown in Figure l, the ozonizing unit H is preferably positioned upon the range III, while the exhaust fan may be positioned as shown in the wall to the rear of the 7 range or it may be positioned in a hood placed above the range.

In Figure 2 the heater elements, of which for convenience only three are shown, are indicated at l3. The heater elements l3 are energized through the electric circuits I4 from supply line l5. Switches it are provided in each of the circuits M for connecting the elements iii to the line IS. The ozonizer unit H comprises an ozonizing element l1 which may be the same as that shown in my copending application, Serial No. 585,101, filed January 6, 1932.

As described in that application, the ozonizing element comprises a dielectric plate having elec trodes secured to the opposite side thereof, one of which is exposed to the atmosphere. The ozonlzing element is connected to the high voltage winding I8 ofa transformer I9. One terminal of the low voltage winding 20 of the transformer I9 is connected to one wire 2| of the supply line I through the conductors Hand 23. The other terminal of the low voltage winding 20 is connected to one terminal of each of the heating units I3 through the conductors 24 and 25. It will be noted that, whenever any of the switches l6 are closed, the low voltage winding 20 is energized from supply line 2| through conductors 23, 22, 24 and 25 back to supply line 26 through the switch I 6 and one side of the heater circuit M.

The conductor 25 is also connected to one terminal of thermostatic switches 21 which are positioned adjacent the heating units l 3. The thermostatic switches 21 may be of conventional design and if an exhaust fan I2 is included in the circuit with them. they should preferably be of the snap disc or element type so as to be able to break the relatively heavy current taken by such fan. The thermostatic switches are normally open and are adapted to close when the temperature of the heater elements is above a predetermined polnt, and are adapted to remain in a closed position until the temperature of the heater elements falls below a predetermined point. The other terminals of the thermostatic switches 21 are connected to the supply line 26 by conductor 28. It is to be noted that the closure of any one of the switches l6 or the thermostatic switches 21 will complete the circuit to the low voltage winding 20 of the transformer l9. Also the winding 20 will be maintained in circuit until all of the thermostatic switches 21 return to an open position.

It is also contemplated in this invention to connect a motor 29 of the exhaust fan I2 in parallel with the low voltage 20 of the transformer 19. Such a connection is shown in Figure 2 wherein conductors 30 and 3| are connected to conductors 22 and 24 respectively and are connected to the motor 29.

It will thus be seen'that both-fan f2 and ozonizer l i are placed in operation whenever any switch I6 is closed. As soon as any one of the heating elements reaches a temperature above a predetermined point, its corresponding thermostatic switch 21 will be closed to maintain the fan and ozonizer in operation. The electric ".range is intended to be used for cooking-ordinary foods or comestibles, and it is well known that certain foods emit a disagreeable and penetrating'odor upon being heated. An exhaust ..fan I2 is effective to eliminate such odors to a certain extent and an ozonizer such as described in my copending application above describe'dis also effective to eliminate suchodors. It is'therefore contemplated that either the fan i2'or the ozonizer ll may be used singly or'that they may bothlbe used in combination. Asis also well-known, heated foods emit odors afterthe supply'of electrical'energy to the heating units has been "interrupted.

"Ihe thermostatic elements 21 are so.p1aced'as to be heated by'the heat retained by theheating elements 1 i3 and by the heated food, placedithereon. 'Since the thermostatic elements maintain the fan 12 and ozonizer ll in operation until the temperature of the heating units and foodthere on drops belowthetemperatureat which" odors are emitted, the present invention is e'fiectiveto eliminate all cooking odors.

If desired, individual switches 32 and 33 may be placed in the circuits of the low voltagetransformer winding 20 and the'fan l2 respectively, such that either or both of these devices maybe maintained out of operation at the optioniofthe operator.

'WhileI have described 'thepreferred embodiment of my inventionin connection with an electric range, it is understoodthat the 'invention'is applicable to devices in which 'heat'is produced by other means than electricpower, and that the structure and arrangement of parts may -be varied within the scopeof the inventionandof the following claims.

What I claimis:

'1. In a device for heating comestibles, a'heater for said comestibles, means for initiating operation of saidheater, a device'for eliminating odors produced by said heated comestib1es,'sai'd means also'being effective to initiate operation or said odor eliminating device and means responsive to the temperature of said'heater and comestibles to continue the operation of sai'd odor eliminating device after said heater lhas'been rendered inoperative and to discontinue the operation of saidodor eliminating device when the-temperature of said heater and comestibles drops to a predetermined point.

.2. Ina device for'heating comestibles, a plurality of heaters, a device for .each'of 'heatersiifor initiating. operation thereof, means for eliminating the odorsproduced by said heatedcomestibles, each of said devicesibeing 'effectiveto initiate operation of said :o'dor eliminating device and means adjacenteach'oflsaid'heaters, responsive'tothe temperature of saidheater andlcomestibles for maintaining said odor "eliminating device in operation'untilthe temperature of said heater and comestibles drops to a predeterm1ned point.

3. In an electric range, a heater unit, a switch for connecting said heater unit to a source of electric power, an ozonizer, said switch also being effective to connect said ozonizer to a source of power, and temperature responsive means for maintaining said ozonizer in connection with its source of power when the temperature of said unit is above a predetermined point.

heater units is above a predetermined point.

5. In an electric range, a plurality of heater units, a switch for each of said heater units for connecting said units to a source of electric power, an ozonizer, each of said switches also being effectiveto connectsaid ozonizer to a source of power, and a temperature responsive means adjacent each of saidhea'ter units for maintaining said ozonizer connected to its source of powe'r when the temperature of any of said heater units is above a predetermined point.

6. "In an electric range, a heater unit, a-switch for connecting said heater unit to a source of electric power, an exhaust fan, said switch also "being efiective to connectsaid exhaust fan toa source of power, and temperature responsive means for maintaining said exhaust fan in connection with its source of power when thetem- "perature of said unit is above a predetermined point.

"ZJIn an-electric range, a plurality'of heater units, a switch for each of said heaterunits 'for connecting said units to a source of electric "power, an exhaust fan, each of said switches'also being effective to connect said exhaust fan to a source of power, and a temperature responsive means for maintaining said exhaust fan'connected toits source of power whenthe temperature'o'f any of said heater units is-above a predetermined point.

8. In an electric range, a plurality of heater 'units, a switch for each of said heater-unitsfior connecting said units to a source of electric 'power'on an exhaust fan, each of said-switches also 'being effective to connect said exhaust fanto a source ofpower, and a temperature responsive "means adjacent each of said heater units for :maintaining said exhaust fan connectedto its :source of power when the temperatureof any of said 'heater units is above a predetermined point.

9. In combination with an electric range, a

heating element, a switch for connecting said element to a source of power, an ozonizer, an-ex- 'haust fan, said switch alsobeing effective toconnect saidozonizer andsaidfan to a source of electric power, temperature responsive means for maintaining said Ian and said ozonizer connected to their sources of electric power'when thetemperature of saidheateris above a predetermined point andto disconnect said fan and ozonizer iromtheir source of power when'the temperature of said heater unit falls below a'predetermined point. 

